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Drying cracks in a ceramic body are caused principally by

  • A.differential shrinkage between surface and interior
  • B.a chemical reaction between the clay and the water
  • C.the body absorbing further water from the damp air
  • D.the binder decomposing at a relatively low temperature

Answer: A

A surface that dries and shrinks while the interior is still wet is put into tension by the restraint. Slower drying, higher humidity and better shape design all reduce the gradient. Humidity control is the principal tool in the early stage.

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